Boring device



March 26, 1940. EDEN 2,195,026

BORING DEVICE Filed Dec. 24, 1937 2 Sheets-Sheet 1 1-, lll

52 I 2 5 1' 54 55 56 25 .v I l 5' I 24 24 g 24 i l 25 E I I i E 26 I 50 i I 2 I 42 r 45 v J J H 52 y 3 INVENTOR I JhMEsA.E0E/v.

ATTORNEY March ze, 1940. YJ.A.EDENT 2,195,026

I 2 Sheets-Sheet Filed Dec. 24, 1957 JqMESA EOE/v. BY 1 17 ATTORNEY Patented Mar. 26, 1940 L UNITED STATES.

Mypresent invention relates to a borijng de- .vice for boring out the interior surface' ofi a cyjlindricalvopening or passage as for examplelthe .-.cylinderofan engine.

a In boring the innersurfaceoi the tubmm bph 'ing of theabove type, a butting tool is rotated and IllQVed downwardly in a gradual helical path to cutwandgshapelthe surface. to a smooth cylindrical bore. When the bore is completed and the m tool has passed completely, through. the bore" it is. releasedfrom the supporting shank so as to avoid the necessity of drawing it up through the ,bcrewhich would score the latter. Heretofore, n this. release of the cutting tool has been hand .operated or manual. H During the downward passage of; the boring tool throughthe bore, it is guided againStvibra tion and,held to a smooth steady course by guides, which closely follow'it into the bore. Heretciore,

these guides have generally extended only over a short distance longitudinally of the bore, so that, i1., .the. cutting tool, is required to; pass through an enlarged space, the guides were not able togspan thelatter and the tool entered the lower part of 2 ,thebore without being held against vibration.

in some cases where the guides were'spring held 'or perated, itwas impossible for thecutter to pass suchan enlarged .space.

.. Thesevarious. disadvantages are obviated in g my present invention; which provides guides of sufiicient length to'span relatively wide spaces and which can automatically assume and rigidly hold the shank of the boring .tool in proper alignment in the opening being bored and which has passed through the passage being bored; The various features of the invention are i1- lustrated by way of example in the accorn panyso ing drawings, in which-- i Fig. 1 is a side elevation partly in sectiono'fa boringdevice embodying a preferred form of the invention; Fig.2 is a vertical elevation of the guide elements of the device of Fig, 1; Figs; 3 and 4 are, respectively, cross-sections, on. lines 33. of Fig. 1 andv 4-4 of Fig. 2, respectively;

Fig.5 is a vertical section on a larger scale'than' that of Fig. 1 of the lower part of the boringtool; Fig. 6 is a cross-section taken on line 66 of (5 ,Fig. -5; Fig.7 is a side view partly in sectiorrofthe cutter'element and Fig. 8 is a verticalsection through the upper part of a boring device embodying a modification of the invention.

In-the boring device of my invention, .a boring 55 head having anumber of radially extendingcut also provides means whereby the cutting or boring tool ,may be automatically released after it.

ting tool s is detachably mountedpn the jlower end la rill s e 1 s e-P. Th Q t erh is mounted and secured in the lower end of the s eqlel me nsp p o e t on" t ad ne p .wardly into thelatter and havin'g one or more .balls;.r e ceiv ed in recesses andpressed into corr pon n eqes n th Je el? @1191 fO- .,i?h

s ind an o prings-Presse mugge- 'Th he cut er ea l s u e 1161a n" h owe nd o be-., r nd iu l nes esfi 110 the work, whereupon the :plunger is" caused to en a d be p h ww' rd l f a {Suitable stop until a grooye is brought into alignment with. fina -a1 wh li e w d w fr engagement the recesses of the, spindle and 15 permit the cutter,

. vr qb r s fi e1 sasem n m s e ert ermean Du i i n ss' si h eu hl ieft filiit r I head is guided p1: stabilized by spaced non-roa m g es-l ma m s."exca'aubwa ra a0 "la i r mar dlt wa rdli e f u per ends 1 tapereddownwardly Their, inner eggg sjestpn Q Su ta ly in ine surfaces 'el l eve l iie h s iamafiheq r. uri c eq he' i 'be re ina a d a e lelfi ih i eerll uliie jei t .25 b 1 ll iiide rbefistedie w re. S

f he w mad b the Games @0 5 ee tejguppoa the spindle against 'sidewise vibration and to h'olcl 'lthe cutting 'tpolisteady. they mar-he e sed. t-i war y. by. a, r s en rt E30 7 such ae d q hr e P e s r l Y. lat e rce a w e ltl eene i the gu d m frte semen w h the-e s? 9f. the bore; "they are pushed upwardly untiltheyfiall withinthe. I

dimensions t e b a'jw erei pon th eme ss,

'the iatterhbeing wed fid against' the' surface and holdingthe spindle steady. Free downward nfio tion. of. t guide is Permitt d, beea'u eeseni bined. on itud nal and. iiadia yti ard. p essure se ves l e hift he e ide urw rd s n 'iz di 540 their ratio with .respect the center offthe spindle" The .taper is how er, sogradual that sidewise or radially inward pressure cannotvidispla eth esuid s;

a.-Re rr ne more t lif y inlth ac mpan i awins's,. .t n ention is described gas applied. to a boring" tool rotatably supportedfrom a spindle. l B in a supporting head.

i ,oi. thebming m chine and...eXt nd n .d w'n Wardly' towardagguid bushing. I .2, anda work .50 pi 13.1 V spindle; in. isirotat upported vin the horinaheaQ l mea s of ballrast irictionbearingssl 4...fIhelbearings. I4 are held in positionlin ,thenhead. .I I by means of "a platej l 5 wredwith: screws J6. A. washer .l] may close 55- "is supported by spider arms 2i) carried byand moved. vertically by pneumatic piston rods or stems i! of pneumatic or fluid pressure cylinders 22. The cylinders 22 may be supplied with pressure fluid to force them downwardly during the boring operation and thereafter be supplied with upwardly acting fluid pressure to free the guide.

The lower end of the sleeve I8 is provided with 'circumferentially spaced recessed notches 23, three being shown by way of example atintervals of 120. In each of these notches, is inserted-the T-shaped upper end of a downwardly; extending guide 24. The outerfaces of the guides 24 are slightly rounded to correspond with the curvature of the guide bushing i2 and the bore piece 43 and their side faces, are approximately parallel.

The inner face of each guide is slightly tapered downwardly and rests against a similarly inclined surface of a groove me lower guide sleeve 26 which moves'vertically with the sleeve [8 and spindle Hi. It will, therefore, be apparent that there are three guides and three grooves in the sleeve 25 equally spaced about the circumference of the sleeve to form properly spaced guide surfaces.v It will be apparentithat when fluid pres sure acts downwardly on the cylinders 22 and thence on the sleeve l8, it tends to force the lowered accordingly. The sleeve 26 is held in fixed position onthe spindle It, being held between an enlarged part of the lower end of the spindle and a washer 32 so that it moves longitudinally with the spindle, but remains stationary while the spindlelrotates. As the head H of the spindle iii approaches thework, but before coming in contact with it, the pneumatic pressure in the cylinders 22 will force the sleeve 18 and the guides 24 resiliently.downwardly to their lowermost position} Astheitool' head enters the work and the lower ends of the guides 24 comeinto contact with the guide ring l2, they will be held while the spindle is lowered a short additional distance until they move inwardlyto correspond exactly with the internal dimensions of the guide guide sleeve rigidly in the bore. When the'guide sleeve-movesdownwardly, the ends of the guides 2'4-will engage, the edge of the bushing l2 and be held while the sleeve 26 moves downwardly, so thatthe three guides draw inwardly or contract until they reachfthe exact inner dimensions of the bore, whereupon they'slide downwardly, following the lower ends of the boring spindle.

For convenience, in manufacture and assembly,

the boring spindle is made of two parts, a lower part 21 having an upper end projecting into a re- In the cess 28 in the lower end of the stem Ill. The upper part of the stem 21 is threaded into the lower end of the recess 28, as at 29 and is prevented from turning therein by means of a pin 30, which extends through a suitable opening in the lower recessed end of the stem ill and through a bifurated upper end of the spindle 21. Openings Si in the sleeve l8 enable the pin 30 to be inserted after the stem 21 has been threaded into the recess 28 and the opening in the stem 10 is brought into alignment with the openings 3|. A lock washer'or nut 32 also serves to prevent the spindle 21 from turning in thethreaded end of the recess 28, v

A pair of lock washers 33 and 34 are also provided on the threaded portion of the spindle 21 the sleeve 18 to tighten or adjust the lock washers. i

The'lower end of the spindle 2! is enlarged as at 38 to form a bearing surface with the lower end of thesleeve 26.

Preferably, the sleeve 26 has a rotatable or bearing engagement with the spindle 21 at the upper end. of the sleeve 26, as at 39 and the lower end, as at 4t, being reduced between these enlarged bearing surfaces to form a space 4!.

The lower end of the spindle 2'! is recessed upwardly and into this recess there is received the upwardly projecting stem 42 of a cutter head 43. The. cutter head 43 and stem 42 have a vertical bore, in which is received a vertically slidable plunger 44 having a reduced zone 45 A pair of diametrically spacedcross-passages or openings, shown at 45, Fig. 6, in the stem 42 carry a pair of balls 41, which are pressed by the plunger 44 partly into recesses 48 in the lower end of the spindle 21, so as to lock the stern rigidly in position on the stem 21. The plunger 44 is normally pressed downwardly to the position shown inFig. l by means of a spring 49 in a recess in the upper end of the plunger and acting against the lower end of arod 5B, the upper end of which reacts against the upper end of the recess in the spindle,

It will, therefore, be apparent that the plunger 44. will beheld downwardly in the locking position of Fig. 1 until its'lower end comes into con tact with a fixed stop, shown in Fig. 5, whereupon it will be pushed upwardly untilthe reduced zone 45 reaches the levelof the crosspassage 4'5 and balls 4], whereupon the latter will be pressed partly into the reduced zone, freeing the stem 42 from the lower end of the spindle, whereupon the cutter head will be forced out of the spindle by the pressure of a spring 5! compressed between the upper end of the stem 42 and the upper surface of the spindle recess.

The cutter head may be of any suitable type The construction shown in Figs. 1, 3 and 5 is desirable as it provides for the rigid support and ready adjustment of a number of circumferentially spaced cutting tools. In this construction, each cutting tool 52 is held in a radially extending slot or space, the inner ends of the cutting tools abutting the cam surfaces of a multiple cam element 53 having a cam surface for each cutting tool. The cutting tools and cam are clamped into positionbetween the lower surface of the cutter head 43 and a supporting plate 54,-by suitable means, such as the screws 55 shown in section in Fig. 3, The cam 53 has a projection 56 downwardly about the plunger 44,

which projection is of a hexagonal or other poly gonal shape, so it may be engaged by a wrench and rotated to adjust the radially outward position of the cutters 52. I

It will be apparent from the above that as the spindle!!! is rotated and the. boring headv ll lowered, the cutting tools 52 will pass within the guide bushing I2 and as they enter the bore 13 the vertical guides 24 will engage the upper edge of the'bushing l2. Further downward movement of the boring head II will cause a relative. 'upwardmovement of the guides 24 on the sleeves 26 and corresponding inward movement until the spacing of the guides is just sufficient to permit' them to enter the bushing Thereafter, the

guides 26 will 'followthe bore made by the cutter and are of sufficient length to span'thepassages or large spaces through which the bore may extend. In any event, the guides will adapt themselves by longitudinalandinward pressure to any suitable bore and will then wedge the guide sleeve in the bore. When the cutter head has finished and passed through the bore, the

' relatively upward movement of the plunger 44 by engagement with the fixed stop releases the cutter head so that the spindle may be brought upwardly without scoring the inner surface of the bore. arrangement the guide isself-adjusting under all circumstancesand no manual operation is re-' quired to adjust this guide nor to release the cutting tool.

It will be noted that the fixed vertical relation to the spindle 21 between the bearing plates 35 and36 and the bearing sur.-'

face 40 and is kept from rotation by'its engagement through the guides 24 withthe sleeve l8.

A somewhat different arrangement is shown in Fig. 8, in which the upper end of the sleeve I8 is not supported by a pneumatically or fluid pressure actuated device, but is threaded into a manually adjustable; ring 58, which is held in fixed relation relative to the spindle l0 between a shoulder 59 on the spindle l0 and a collar 69 threaded on to the stern liland engaging the upper end of the sleeve 58. Thrust bearing washers 6| are provided between the collar and the upper end of the sleeve 58 and similarly bearing washers are provided between the shoulder 59 and the shoulder or shelf 63 on the sleeve 58. It will beapparent from the above, that by rotating the sleeve 58, the sleeve [8 may be adjusted vertically relative to the spindle l0 until, the periphery of the guides. 24 come to the proper dimension, whereupon the sleeve .58 may be tightened by a bolt indicated in section at 58 to grip the sleeve IS in the adjusted position.

The thrust bearings '35,

the bore morereadily;

It will be apparent that with the above sleeve 26 is held in 36, El and '62 may be of any suitable type, suchvas ball roller bearings,

where space permits. The bearing plates shown being merely conventional.

. The guides 24 are readily removable so that they may be replacedby guides of different dimensions to accommodate the apparatus through bores of different sizes. In the above invention, it will be apparent that the cutter head may be readilyinserted before the boring .is. started and will be automatically released when r the boring is completed. Also that in the embodiment shown in Fig. l the guides will require I no adjustment, but will automatically take a position corresponding to the dimensions of the bore and will retainthese positions against any sidewise pressure. The lower ends oflthe guides may be slightly tapered so that they will enter What I claim is; I

"1. Apparatus for boring which comprises a tool-holding spindle havingtool holding means at one end,a guide sleeve encircling and guiding 2. Apparatus for boring which comprises a tool-holding spindle having tool holding means at one end, a guide sleeve encircling and guiding said spindle,'said sleeve having longitudinally extending grooves at circumferentially spaced intervals, the bottoms of said grooves sloping radially outwardly toward the tool'end, guides,.one

for each groove, and means comprisinga sleeve slidable longitudinally relative to said spindle and interlocking with said guides to hold said guides against longitudinal movement on said sleeve and fluid pressure. means to move said sleeve and guides longitudinally in either direction.

3. Apparatus for boring which comprises a 'tool holding spindle having a free tool holding end, a guide sleeve encircling and guiding said spindle and moving with said spindlein fixed longitudinal position on'said spindle, said spindle being freely rotatable within said guide sleeve, said sleeve having longitudinally extend.-

ing grooves at circumferentially spaced intervals on its outer surface, the bottoms of the grooves sloping radially outwardly towards the tool holding end, guides, one for each groove, and means to hold said guides against longitudinal movement on said sleeve and pneumatic means to move said guides toward the tool end of saidsplndle when-saidspindle is advanced, and in the opposite direction when it is withdrawn.

JAMES A. EDEN. 

